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client.go
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client.go
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package gossh
import (
"bytes"
"compress/gzip"
"crypto/sha256"
"encoding/base64"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"time"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
func New(host, user string) (c *Client) {
return &Client{
User: user,
Host: host,
}
}
type Client struct {
User string
Host string
Port int
Agent net.Conn
password string
Conn *ssh.Client
DebugWriter Writer
ErrorWriter Writer
InfoWriter Writer
PrivateKey string
}
func (c *Client) Password(user string) (password string, e error) {
if c.password != "" {
return c.password, nil
}
return "", fmt.Errorf("password must be set with SetPassword()")
}
func (c *Client) Close() {
if c.Conn != nil {
c.Conn.Close()
}
if c.Agent != nil {
c.Agent.Close()
}
}
func (client *Client) Attach() error {
options := []string{"-o", "UserKnownHostsFile=/dev/null", "-o", "StrictHostKeyChecking=no"}
if client.User != "" {
options = append(options, "-l", client.User)
}
options = append(options, client.Host)
cmd := exec.Command("/usr/bin/ssh", options...)
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
cmd.Stdin = os.Stdin
cmd.Env = os.Environ()
return cmd.Run()
}
func (c *Client) SetPassword(password string) {
c.password = password
}
func (c *Client) SetPrivateKey(privateKey string) {
c.PrivateKey = privateKey
}
func (c *Client) Connection() (*ssh.Client, error) {
if c.Conn != nil {
return c.Conn, nil
}
e := c.Connect()
if e != nil {
return nil, e
}
return c.Conn, nil
}
func (c *Client) ConnectWhenNotConnected() (e error) {
if c.Conn != nil {
return nil
}
return c.Connect()
}
func (c *Client) Connect() (err error) {
if c.Port == 0 {
c.Port = 22
}
config := &ssh.ClientConfig{
User: c.User,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
keys := []ssh.Signer{}
if c.password != "" {
config.Auth = append(config.Auth, ssh.Password(c.password))
}
if c.Agent, err = net.Dial("unix", os.Getenv("SSH_AUTH_SOCK")); err == nil {
signers, err := agent.NewClient(c.Agent).Signers()
if err == nil {
keys = append(keys, signers...)
}
}
if len(c.PrivateKey) != 0 {
if pk, err := readPrivateKey(c.PrivateKey); err == nil {
keys = append(keys, pk)
}
} else {
if pk, err := readPrivateKey(os.ExpandEnv("$HOME/.ssh/id_rsa")); err == nil {
keys = append(keys, pk)
}
}
if len(keys) > 0 {
config.Auth = append(config.Auth, ssh.PublicKeys(keys...))
}
c.Conn, err = ssh.Dial("tcp", fmt.Sprintf("%s:%d", c.Host, c.Port), config)
return err
}
func readPrivateKey(path string) (ssh.Signer, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
b, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
return ssh.ParsePrivateKey(b)
}
func (c *Client) Execute(s string) (r *Result, e error) {
started := time.Now()
if e = c.ConnectWhenNotConnected(); e != nil {
return nil, e
}
ses, e := c.Conn.NewSession()
if e != nil {
return nil, e
}
defer ses.Close()
tmodes := ssh.TerminalModes{
53: 0, // disable echoing
128: 14400, // input speed = 14.4kbaud
129: 14400, // output speed = 14.4kbaud
}
if e := ses.RequestPty("xterm", 80, 40, tmodes); e != nil {
return nil, e
}
r = &Result{
StdoutBuffer: &LogWriter{LogTo: c.Debug},
StderrBuffer: &LogWriter{LogTo: c.Error},
}
ses.Stdout = r.StdoutBuffer
ses.Stderr = r.StderrBuffer
c.Info(fmt.Sprintf("[EXEC ] %s", s))
r.Error = ses.Run(s)
c.Info(fmt.Sprintf("=> %.06f", time.Now().Sub(started).Seconds()))
if exitError, ok := r.Error.(*ssh.ExitError); ok {
r.ExitStatus = exitError.ExitStatus()
}
r.Runtime = time.Now().Sub(started)
if !r.Success() {
r.Error = fmt.Errorf("process exited with %d", r.ExitStatus)
}
return r, r.Error
}
func (c *Client) Debug(args ...interface{}) {
c.Write(c.DebugWriter, args)
}
func (c *Client) Error(args ...interface{}) {
c.Write(c.ErrorWriter, args)
}
func (c *Client) Info(args ...interface{}) {
c.Write(c.InfoWriter, args)
}
var b64 = base64.StdEncoding
func (c *Client) WriteFile(path, content, owner string, mode int) (res *Result, e error) {
return c.Execute(c.WriteFileCommand(path, content, owner, mode))
}
func (c *Client) WriteFileCommand(path, content, owner string, mode int) string {
buf := &bytes.Buffer{}
zipper := gzip.NewWriter(buf)
zipper.Write([]byte(content))
zipper.Flush()
zipper.Close()
encoded := b64.EncodeToString(buf.Bytes())
hash := sha256.New()
hash.Write([]byte(content))
checksum := fmt.Sprintf("%x", hash.Sum(nil))
tmpPath := "/tmp/gossh." + checksum
dir := filepath.Dir(path)
cmd := fmt.Sprintf("sudo mkdir -p %s && echo %s | base64 -d | gunzip | sudo tee %s", dir, encoded, tmpPath)
if owner != "" {
cmd += " && sudo chown " + owner + " " + tmpPath
}
if mode > 0 {
cmd += fmt.Sprintf(" && sudo chmod %o %s", mode, tmpPath)
}
cmd = cmd + " && sudo mv " + tmpPath + " " + path
return cmd
}
func (c *Client) Write(writer Writer, args []interface{}) {
if writer != nil {
writer(args...)
}
}
// Returns an HTTP client that sends all requests through the SSH connection (aka tunnelling).
func NewHttpClient(sshClient *Client) (httpClient *http.Client, e error) {
if e = sshClient.ConnectWhenNotConnected(); e != nil {
return nil, e
}
httpClient = &http.Client{}
httpClient.Transport = &http.Transport{Proxy: http.ProxyFromEnvironment, Dial: sshClient.Conn.Dial}
return httpClient, nil
}